Loan Recovery Agents — harassment from loan recovery agents

In our society one resident has taken loan from bank, now loan recovery agents are been calling me and asking me to give him remainder about defaultness, also calling on my office no. Which cause severe problem to my office colleagues, also causing me stress/disturbance for no fault of mine.
Also police don't take my complaint. I am receiving call from no.[protected],[protected]. It has causing me lot of problem to me and my family.
Agents says that we will keep on calling you and disturbing you if you dont do as we say.
Also that defaulter is never at home.